Is this iPhotos also for Photos ?

YOUr question is not very clear, but I'll have a god.

iPhoto is no longer developed. A new app, Photos, has been released. It is similar is many respects but has a whole extra feature called the iCloud Library.

Nothing is transferred "from a raw photo". Your raw and versions are migrated to the Photos library. But be aware that Photos is not a replacement for Aperture.

Greg, the forum for the new Photos.app is here: Photos for Mac

It is grouped below Mac OS & System Software, because it is not a stand-alone aplication, but directly installed as part of MacOS X Yosemite or El Capitan.

See this support document on how Photos will transfer content from an Aperture library: How Photos handles content and metadata from iPhoto and Aperture - Apple Support

If you open an Aperture library in Photos, the Photos.app will create a new library and store the RAW images as original image files, just like Aperture does. Referenced originals will remain referenced, managed originals will remain managed. Alle dits will be applied losslesjust like in Aperture, so you can always revert the the original RAW file. If you used brushed adjustments or other adjustments, that cannot be reproduced in Photos, edited versions will be migrated as a new quasi-master in addition to the original file.

, does that mean that any and all adjustments made in Aperture that are not available in Photos will be removed ?

You will see two photos in Photos: One photo with all adjustments applied by Aperture, and the original image file. If you want to edit the Aperture edited version further in Photos, you have first to revert it to original, because Photos cannot add to brushed Aperture adjustments.